Device for reminding safety when waiting on railway platform

The utility model relates to a device for reminding safety when waiting on railway or subway platform, which comprises an M laser generator and an M light sensitive resistor arranged at the two ends of a straight-line platform yellow line. The laser beam generated by the M laser generator can be projected onto the M light sensitive resistor; and an N laser generator and an N light sensitive resistor are arranged on two sides of the rails positioned on the outer side of the platform yellow line and crosses over the rails, and the laser beam generated by the N laser generator can be projected onto the N light sensitive resistor. The device also comprises a buzzer, a relay, an M battery and an N battery. The M battery, the M light sensitive resistor and the electromagnetic coil of the relay are serially connected to form an electric circuit; and the N battery, the N light sensitive resistor, the buzzer, the traveling contact piece of the relay and an E contact contacting with the traveling contact piece of the r